How to Wash Oil Painting Brushes So They Keep Their Edge

♦ ♦ ♦ JULY 22, 2026 | 4 MIN READ How to Wash Oil Painting Brushes So They Keep Their Edge At a Glance Almost every guide on how to wash oil painting brushes is really about getting colour off the tip. The thing that actually ends a brush is dried paint packed into the heel, where the bristles meet the ferrule, and once that sets the brush can only make one mark for the rest of its life. There is a filbert on my bench that I have had for eleven years. The bristle is shorter than it was, the varnish is gone off the handle, and it still comes to a clean edge. Next to it in the jar are three brushes I bought last spring that are already fat and splayed at the base and good for nothing but scrubbing in a ground. Same maker. Same price. The difference is entirely how they were washed in the first month. What oil painting brushes actually die of A brush is not a bundle of hair. It is a spring with a shaped tip, and the shape depends on every filament sitting parallel and being able to return. Winsor & Newton ’s own guide describes what makes a hog brush work: “Bristles that split into two or three tips (known as flags), they hold more paint and deliver it evenly.” Those flags are the whole tool. They are what lets a bristle brush carry a heavy load and still lay a clean edge instead of dumping it. Now think about where the paint goes when you rinse a brush by swirling the tip in a jar. The colour leaves the outer half. The inner core, right down at the ferrule, keeps a little. Next session, a little more. After about three weeks the heel has a hard collar of dried paint in it, the filaments are wedged apart at the base, and the tip splays permanently because the bristles cannot sit parallel any more. Brushes do not die at the tip. They die at the heel. That is why an eleven-year-old brush can be better than a three-month-old one. Nothing was ever allowed to set at the base. How to wash oil painting brushes, in the order that matters Wipe hard first, on rag or newspaper. Most of the paint should never reach any liquid. Pinch the ferrule and pull the brush through the cloth, base to tip, several times. Then oil, not solvent. A dish of cheap vegetable oil or safflower oil, worked into the heel with the fingers, dissolves oil paint perfectly well because it is chemically the same family. Wipe again. Then soap and water. Winsor & Newton say it exactly: “create a soapy lather with warm (never hot) water until it runs clear.” Hot water swells the ferrule and softens the adhesive inside it. Lather at the base, never the tip. Work the soap in at the ferrule with a thumb and squeeze outward. This is the step that decides whether the brush survives. Reshape wet, dry flat or upright. Their instruction is “Leave brushes to dry with bristles facing upwards.” Never point-down in a jar. Wet hog bristle is keratin under load, and it takes a permanent set in whatever bend it dries in. If solvent stays in the kit, keep it for the palette and the knives rather than